125521245 has 20 divisors (see below), whose sum is σ = 225009180. Its totient is φ = 66944448.

The previous prime is 125521243. The next prime is 125521271. The reversal of 125521245 is 542125521.

It can be written as a sum of positive squares in 2 ways, for example, as 27154521 + 98366724 = 5211^2 + 9918^2 .

It is not a de Polignac number, because 125521245 - 2¹ = 125521243 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125521241) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 154560 + ... + 155369.

It is an arithmetic number, because the mean of its divisors is an integer number (11250459).

Almost surely, 2^125521245 is an apocalyptic number.

125521245 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

125521245 is a deficient number, since it is larger than the sum of its proper divisors (99487935).

125521245 is an equidigital number, since it uses as much as digits as its factorization.

125521245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309946 (or 309937 counting only the distinct ones).

The product of its digits is 4000, while the sum is 27.

The square root of 125521245 is about 11203.6264218332. The cubic root of 125521245 is about 500.6940295336.

Adding to 125521245 its reverse (542125521), we get a palindrome (667646766).

It can be divided in two parts, 1255 and 21245, that added together give a square (22500 = 150²).

The spelling of 125521245 in words is "one hundred twenty-five million, five hundred twenty-one thousand, two hundred forty-five".